Kenneth D Jenkins

US Patent:

43471552, Aug 31, 1982

Filed:

Mar 19, 1981

Appl. No.:

6/245421

Inventors:

Kenneth L. Jenkins - Littleton CO

Assignee:

Manville Service Corporation - Denver CO

International Classification:

C04B 3126
C04B 3122
F27B 1500

US Classification:

252378P

Abstract:

A thermally efficient process for the expansion of perlite ore is described. The inlet port and burner of a perlite expansion chamber (preferably a vertical expander) are enclosed such that no ambient air can enter the chamber. Air and fuel are metered to the burner with the amount of air being controlled such that the fuel/air premix contains at least enough air to start and maintain minimum combustion, but not enough to provide stoichiometric combustion. At a point immediately above the burner, additional air is metered into an insulated enclosure surrounding the expansion chamber where it is preheated by the heat passing through the chamber walls. This preheated additional air is then circulated back to the burner where it provides the remainder of the air needed for combustion, normally full combustion. Flow of the burner fuel/air premix and the preheated additional air is controlled so as to maintain a long luminous flame throughout a substantial portion of the expansion chamber and also to form a moving laminar layer of air on the inner surface of the expansion chamber. Preferably the burner is a delayed mixing gas burner which materially aids in the generation of the long luminous flame.

US Patent:

46346228, Jan 6, 1987

Filed:

Sep 16, 1985

Appl. No.:

6/776252

Inventors:

Kenneth L. Jenkins - Littleton CO
Stanley C. Suhaka - Englewood CO
Rick L. Dolin - Littleton CO
Allan R. LaRoche - Lewiston ME
Robert E. Hodgson - Littleton CO
Neil R. Such - Englewood CO
Douglas D. Smith - Highlands Ranch CO
Frank R. Newton - Littleton CO
Richard N. Cunningham - Littleton CO

Assignee:

Manville Corporation - Denver CO

International Classification:

B32B 1102
B32B 1110
B05D 112

US Classification:

428143

Abstract:

A lightweight asphalt roofing product wherein the asphalt-based coating has a specific gravity less than 1. A lightweight filler is used which has an effective specific gravity in the range of 0. 10-0. 50 and is present in the coating in the range of 3%-25% by weight of the filled coating. In a preferred embodiment, the filler particles have hollow, gas filled inclusions, and comprise expanded perlite particles or expanded permicite particles.